DETENT ESCAPEMENT AND MECHANICAL CLOCK

Title:

DETENT ESCAPEMENT AND MECHANICAL CLOCK

Document Type and Number:

WIPO Patent Application WO/2011/111250

Kind Code:

A1

Abstract:

Disclosed is a detent escapement (100), comprised of an escape wheel (110), a balance wheel (120) provided with an impulse pallet (122) and an unlocking jewel (124), and a blade (130) provided with a locking jewel (132). With the balance wheel situated at the centre of oscillation, a straight line drawn starting at the centre of rotation thereof and passing through the centre of rotation of the blade forms a rotation reference line. In order to balance the sum total of: the effect on the rotational movement of the balance wheel caused by 'impulse before dead centre', and the effect on the rotational movement of the balance wheel caused by 'resistance after dead centre', which together comprise the total effect causing the clock to advance; and the sum total of the effect on the rotational movement of the balance wheel caused by 'resistance before dead centre', and the effect on the rotational movement of the balance wheel caused by 'impulse after dead centre', which together comprise the total effect causing the clock to slow; the unlocking jewel is aligned with the rotation base point line and fixed at a position facing towards the direction farthest from the escape wheel.

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Inventors:

KODA MASAYUKI (JP)
UCHIYAMA HIROKI (JP)
NIWA TAKASHI (JP)

Application Number:

PCT/JP2010/064819

Publication Date:

September 15, 2011

Filing Date:

August 31, 2010

Export Citation:

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Assignee:

SEIKO INSTR INC (JP)
KODA MASAYUKI (JP)
UCHIYAMA HIROKI (JP)
NIWA TAKASHI (JP)

International Classes:

G04B15/14; G04B17/06; G04B18/02

Foreign References:

CH3299A	1891-08-31
JP2005164599A	2005-06-23
JP2009510425A	2009-03-12

Other References:

SHIGEO MORI: "Dasshinki Gosa no Kenkyu", JOURNAL OF THE HOROLOGICAL INSTITUTE OF JAPAN, vol. 54, 25 June 1970 (1970-06-25), pages 31 - 47

Attorney, Agent or Firm:

KUHARA, Kentaro et al. (JP)
Kentaro Kuhara (JP)

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